US2743415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gradiometer
Assignee: Individual
•
Filing: 1946-09-30
•
Granted: 1956-04-24
•
Expires: 1966-09-30
Abstract
No abstract record available.
Inventors
- 👤 Kenneth G Williams
- 👤 Eugene W Frowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:36
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/04; G01R33/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1863415A
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US2335117A
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US2383459A
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US2407202A
Cited
US2406870A
Cited
US2410039A
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US2414654A
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US2418553A
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US2379716A
Cited
US2426622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |